# LiteLLM has Server-Side Template Injection vulnerability in /completions endpoint

Advisory record · `GHSA-46cm-pfwv-cgf8`

- **Identifiers:** `GHSA-46cm-pfwv-cgf8` · `CVE-2024-2952` · `PYSEC-2026-387`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-76](https://cwe.mitre.org/data/definitions/76.html)
- **Tags:** [CWE-76](https://agentprime.io/advisories/tag/cwe-76.md)
- **Published:** 10 Apr 2024
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 10 Apr 2024, 18:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `litellm` (PyPI): affected `<1.34.42`; fixed in `1.34.42`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> LiteLLM versions before 1.34.42 are vulnerable to server-side template injection through the /completions endpoint. The hf_chat_template method renders the chat_template value from tokenizer_config.json with Jinja without sanitization, so an attacker who can supply a malicious tokenizer_config.json could execute arbitrary code on the server. Upgrade litellm to version 1.34.42 or later.

Written 5 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 9.8 Critical, CVSS 3.0: `CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`, from CNA (@huntr_ai)

- **CISA KEV:** Not listed.
- **EPSS:** 0.013, the 69th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:35 UTC: First seen by agentprime
- 31 Oct 2026, 14:35 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-46cm-pfwv-cgf8)

## Sources

- [GitHub Advisory Database: GHSA-46cm-pfwv-cgf8](https://github.com/advisories/GHSA-46cm-pfwv-cgf8)
- [OSV: GHSA-46cm-pfwv-cgf8](https://osv.dev/vulnerability/GHSA-46cm-pfwv-cgf8)
- <https://nvd.nist.gov/vuln/detail/CVE-2024-2952>
- <https://github.com/BerriAI/litellm/issues/2949>
- <https://github.com/BerriAI/litellm/pull/2941>
- <https://github.com/BerriAI/litellm/commit/8a1cdc901708b07b7ff4eca20f9cb0f1f0e8d0b3>
- <https://github.com/BerriAI/litellm>
- <https://github.com/BerriAI/litellm/blob/0d803e13798db40aa7463e64a6bafaee386424f5/litellm/proxy/proxy_server.py#L2087>
- <https://github.com/advisories/GHSA-46cm-pfwv-cgf8>
- <https://github.com/pypa/advisory-database/tree/main/vulns/litellm/PYSEC-2026-387.yaml>
- <https://huntr.com/bounties/a9e0a164-6de0-43a4-a640-0cbfb54220a4>
- <https://pypi.org/project/litellm>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-46cm-pfwv-cgf8>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-46cm-pfwv-cgf8/>. Everything for agents: <https://agentprime.io/llms.txt>.